Making sense of minimum flexural reinforcement requirements for reinforced concrete members

Seguirant, Stephen J.; Brice, Richard; Khaleghi, Bijan

doi:10.15554/pcij.06012010.64.85

Cited by 12 publications

(5 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The reinforcement reaction is included in the numerical algorithm proposed in the next section as an external applied force, function of the crack opening displacement according to a suitable constitutive law. On the basis of the bond‐slip relationship provided by fib Model Code 2010 [5], and by imposing equilibrium and compatibility conditions, it is possible to correlate the reinforcement reaction to the relative slip at the crack edge, which corresponds to half the crack opening displacement. Typically, the relationship obtained is characterized by an ascending branch up to steel yielding, corresponding to which there is a critical value of the crack opening w y .…”

Section: Analytical and Numerical Investigationmentioning

confidence: 99%

“…According to the approach of the ACI 318 Building Code [3, 4], the condition of minimum reinforcement is defined by the equality ϕ M u = M cr , where ϕ is a resistance factor, assumed to be 0.9, M u is the nominal flexural resistance (or ultimate load) given by the reaction of the yielded reinforcement times the moment arm, and M cr is the cracking moment of the plain concrete section evaluated on the basis of the flexural tensile strength f ct, fl . By means of simple substitutions and some analytical manipulations (see Seguirant et al [5] for more details), the value for the minimum reinforcement area can be expressed thus:…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dinuclear Cobalt Complexes with a Decadentate Ligand Scaffold: Hydrogen Evolution and Oxygen Reduction Catalysis

Giovanni

Gimbert‐Suriñach

Nippe

et al. 2015

Chemistry A European J

View full text Add to dashboard Cite

A new decadentate dinucleating ligand containing a pyridazine bridging group and pyridylic arms has been synthesized and characterized by analytical and spectroscopic techniques. Four new dinuclear cobalt complexes featuring this ligand have been prepared and thoroughly characterized both in the solid state (X-ray diffraction) and in solution (1D and 2D NMR spectroscopy, ESI-MS, and electrochemical techniques). The flexible but stable coordination environment provided by the ligand scaffold when coordinating Co in different oxidation states is shown to play a crucial role in the performance of the set of complexes when tested as catalysts for the photochemical hydrogen evolution reaction (HER) and chemical oxygen reduction reaction (ORR).

show abstract

Section: Analytical and Numerical Investigationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dinuclear Cobalt Complexes with a Decadentate Ligand Scaffold: Hydrogen Evolution and Oxygen Reduction Catalysis

Giovanni

Gimbert‐Suriñach

Nippe

et al. 2015

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…Seguirant et al [12] suggested reserve strength at nominal (Pn/Pcr) at least (1.46) for evaluating minimum flexural reinforcement for rectangular beams, therefore, a comparison conducted for the beams satisfied the proposed formula and the results shows that all the reserve strength values at a nominal capacity of these beams are greater than the recommended value. The proposed formula strength of concrete, satisfying the reserve strength at yielding of steel reinforcement (Py/Pcr) and the reserve strength at nominal capacity (Pn/Pcr).…”

Section: The Proposed Formula For Rectangular Hsc Beamsmentioning

confidence: 91%

Influence of Minimum Tension Steel Reinforcement on the Behavior of Singly Reinforced Concrete Beams in Flexure

Abdulsada

Khalel²,

Sarsam³

2020

ETJ

View full text Add to dashboard Cite

The requirements of minimum flexural reinforcement in the last decades have been a reason for controversy. The structural behavior of beams in bending is the best way of investigating and evaluating the minimum reinforcement in flexure. For this purpose, twelve singly reinforced concrete beams with a rectangular cross-section of (125 mm) width by (250 mm) height and (1800 mm) length were cast and tested under two-point loads up to failure. These beams were divided into three groups with different compressive strengths (25, 50, and 80 MPa). Each group consists of four beams with different amounts of tension steel reinforcement approximately equal to (0% Asmin, 50% Asmin, 100% Asmin and 150% Asmin), two bar diameters (Ø6 mm and Ø8 mm) were used as the longitudinal tension reinforcement with different yield and ultimate strengths, the minimum amount of reinforcement required is calculated based on ACI 318M-2014 code. The results show that for the reinforced concrete beams, the flexural reinforcement in NSC beams increases the first cracking load and the increment increased with an increasing amount of reinforcement, while for HSC beams the increasing in first cracking load are very little when the quantity of reinforcement less than the minimum flexural reinforcement and increased with the increasing amount above the minimum flexural reinforcement. The equation of ACI 318M-14 code gives adequate minimum flexural reinforcement for NSC and overestimate value for HSC up to (83 MPa), A new formula is proposed for HSC rectangular beams up to (90 MPa) concrete compressive strength by reducing the equation of ACI 318M-14 code for minimum flexural reinforcement by a factor depending on concrete compressive strength.

show abstract

“…식 (5)는 직사각형 단면으로부터 유도한 것으로서 z는 단면계수이고 상수 는 T형 단면 등 단 면 형상을 보정하기 위한 계수이다 (Seguirant et al 2010). Seguirant et al(2010)에 따르면 는 직사각형 단면에 대해 1.0의 값을 갖고, T형 단면에 대하여 플랜지에 압축응력이 작용하는 경우 1.3~1.6, 플랜지에 인장응력이 작용하는 경우 3.0~4.0의 값을 갖는다. 한편, 식 (5)의     는 ACI 318 에서 규정하는 콘크리트의 파괴계수   이다.…”

Section:   ≥  unclassified

“…하지만 값이 0.25를 초과하는 단면 에 대해서는 식 (2)에 따른 최소 철근량 배근으로 연성파괴를 보장할 수 없음을 알 수 있다. 한편, T형 단면의 플랜지가 인장 을 받는 경우, 일반적으로 를 0.50으로 취하여 식 (9)와 같이 최 소 휨 철근량을 산정할 수 있다 (Seguirant et al 2010).…”

Section:   ≥  unclassified

Minimum Reinforcement Specifications for Flexural Reinforced Concrete Members

김민영¹,

조재열²,

이형준³

2018

JKCI

View full text Add to dashboard Cite

Structural concrete design codes provide several specifications for the minimum reinforcement. For flexural reinforced concrete members, three types of provisions are considered in a design process. First, minimum flexural reinforcement criteria are specified to ensure structure's ductile behavior. Second, provisions for preventing excessive cracks induced by shrinkage and temperature changes are specified in most design codes. Also, there are provisions to control a crack width in a service limit state. The above each provision is defined according to a different basis and provides different required reinforcement amount. This paper investigates these minimum reinforcement criteria of Korea Structural Concrete Design Code 2012, Korean Highway Bridge Design Code (Limit State Design), ACI 318: Building Code Requirements for Structural Concrete and Eurocode 2: Design of Concrete Structure. The basis of the minimum reinforcement criteria in each design code was examined and compared with each other in terms of reinforcement amount for rectangular and T-shaped singly reinforced concrete sections. The study concludes that there is an issue between the minimum reinforcement provision for ensuring ductile behavior and that for crack control in the service limit state specified in the Korean Highway Bridge Design Code. In typical sections, minimum reinforcement areas for ductile behavior were always larger than those for crack control.

show abstract

Making sense of minimum flexural reinforcement requirements for reinforced concrete members

Cited by 12 publications

References 1 publication

Dinuclear Cobalt Complexes with a Decadentate Ligand Scaffold: Hydrogen Evolution and Oxygen Reduction Catalysis

Dinuclear Cobalt Complexes with a Decadentate Ligand Scaffold: Hydrogen Evolution and Oxygen Reduction Catalysis

Influence of Minimum Tension Steel Reinforcement on the Behavior of Singly Reinforced Concrete Beams in Flexure

Minimum Reinforcement Specifications for Flexural Reinforced Concrete Members

Contact Info

Product

Resources

About